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H. A. LUGRIN.

STOP WATCH. No. 302,749. Patented July 29, 18-84.

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HENRY A. LUGRIN, OF NEW YORK,

PAreNr I ma.

n. Y., ASSIGNOR TO nrnsnnr Ann 'PROSPER NORDMANN, OF SAME PLACE.

STOP-WATCH.

SPECIFICATION forming part of Letters Patent No. 302,749, dated July 29,1884.

Application filed November 26, 1883. (No modelJ Zo (.tZ whom it may concern:

Be it known that I, HENRY A. LUGRIN, of the city, county, andState of NewYork, have invented certain new and useful Improvements in StopWVatches, of which the following is a specification.

This invention has reference to certain improvements in stop-watches for which Letters Patent have been granted to me heretofore, No. 232,737, dated September 28, 1880,whereby the mechanism for operating the quartersecond hand is set in motion from the arbor of the fourth wheel of the watch-movement by an intermediate mechanism, which is quickly thrown in or out of gear, so as to produce the instant and reliable starting or stopping of the quarter-second hand; and the invention consists of a vertically-movable bevel-pinion that is thrown into gear with a bevel-wheel on the arbor of the fourth wheel and a bevel-wheel on the arbor of the quarter-second hand, said bevel-pinion being raised or lowered by a forked spring and actuatinglever, so as to start or stop the quarter-second hand.

Theinvention consists, secondly, of the combination, with the arbor of the bevel-pinion, of aforked spring, one arm of which presses on the arbor of the bevel-pinion, alever for engaging the other end of said spring, a spring that exerts a lifting action on the bevel-pinion, a bevel-wheel on the arbor of the fourth wheel and on the arbor of the second-hand, and a spring of less power-than the spring of the bevel-pinion that presses upon the bevelwheel on the arbor of the quarter-second hand, so as to produce the reliable intermeshing of the bevel-pinion and the bevel-wheels whenever the former is thrown into mesh therewith,as will be more fully described hereinafter, and finally be pointed out in the claims.

In the accompanying drawings, Figure 1 represents a top view of my improved stopwatch, in which the different operating parts are shown in their respective positions when the quarter-second hand is at zero. Figs. 2 and 3 are detail top views showing the operating parts of the stop-watch, respectively, in position when the quarter-second hand is started and stopped. Fig. 4 is avertical transverse section on line as m, Fig. 1; and Fig. 5 is a detail side view, partly in section, on line y 3 Fig. .2, of the forked spring for throwing the bevel-pinion in or out of gear with the motion-transmitting bevel-wheels.

Similar letters of reference indicate corresponding parts.

My improved timing attachment for stopwatches is set in motion by the arbor of the fourth wheel of the watch-movement, which arbor carries a minutely-toothed bevel-wheel, a. The arbor of the quarter-secondhandA is also provided with a minutely-toothed bevelwheel, I), on which presses a spring, b.

Intermediately between the bevel-wheels a and b is arranged a finely-toothed bevel-pin-v ion, d, the arbor d of which is supported in bearings of the main bridge B of the watchmovement, and of an auxiliary bridge, B, that supports the different arbors of the timing attachment. The bevel-pinion d is acted upon at its under side by a spring, 0, of a greater strength than the spring I) of the bevel-wheel b, the spring 6 tending to lift the bevel-pinion (1 whenever one end, f, of a forked spring, G, that presses on the arbor of the bevel'pinion is raised. The forked spring Ois attached to the auxiliary bridge B, its second arm, f, being bent downward toward the main bridge B, and engaged. or released by a spring-lover, D. The lever D is operated by a double ratchet wheel, E, which also operates the shifting-lever F and the brake-lever G, that is placed in or out of contact with the circumference of the bevel-wheel of the quarter-second hand. The starting and stopping lever H is operated in the usual manner by a pushpin'from the outside of the watch-case. The shifting-lever F engages a heart-cam on the arbor of the bevel-wheel b, which, together with the double ratchetwheel, shifting-lever, brake-lever, and starting-lever, form the wellknown accessories of the stop-watches in general use, and which require no special description.

The operation of my improved stop-watch is as follows: For starting the quarter-second hand, the lever H is oscillated by the pushpin and the double ratchetwheel Gr moved,

whereby the shifting and brake levers are respectively moved away from the heart-cam and the bevel-wheel on the arbor of the quarter-second hand. Simultaneously the lever D is moved by the double ratchet'wheel G, so thatits beveled outer end passes below the lower arm, 1'', of the forked spring 0, whereby the arm f is raised, and thereby the bevelpinion (I instantly lifted by its spring 6 and thrown into gear with the bevel-wheels a and b, the teeth of which are parallel to the teeth of the bevel-pinion. To prevent the jarring by the too sudden intermeshing of the teeth of the bevelpinion (Z with the bevel-wheel b of the quarter-second hand, a small degree of play is given to the arbor of the latter, which play, however, is compensated by the pressure of the spring 6 on the bevel-wheel I). As this spring, however, is of about half the force of the spring 0 acting on the bevel-pinion, it recedes slightly and admits thereby the quick and reliable intermeshing without exerting any jar or concussion, and consequently without producing any vibratory effect or lost motion on the quarter-second hand. The quarter-second hand is therefore instantly started, and moved forward until stopped by the second depression of the stop-lever H, which applies, by the double ratchet-wheel, the brake-lever G to the circumference of the bevel-wheel I), while the lever D recedes from the lower arm, 1'', of the spring 0, as shown in Fig. 3, and causes, by the pressure of the upper arm, f, of the spring 0 upon the arbor of the bevel-pinion (Z, the lowering of the bevel-pinion against the pressure of its spring 6, so that the bevel-pinion is thrown out of gear with the bevel-wheels a and I), and thereby the quarter-second hand stopped. The shifting-lever F is held at a proper distance from the heart-cam, as shown in Fig. 3. A third depression of the stopping-lever H applies the shifting-lever to the heart-cam, and moves the brake-lever away from the bevel-wheel Z), as shown in Fig. l, whereby the quarter-second hand is returned to the starting-point. The lever D, that raises the arm f of the forked spring 0, remains in the same position as in Fig. 8, with the bevelpinion in lowered position. In this manner the different operations of starting, stopping, and returning the quartersecond hand are accomplished in a reliable manner, and motion transmitted to the quarter-second hand at the proper time by the raising or lowering of the intermediate bevel-pinion, while in the stopwatches heretofore in use, either the bevelwheel on the arbor of the fourth wheel or the bevel-wheel on the arbor of the quarter-second hand was thrown in or out of mesh with the intermediate bevel-pinion.

Having thus described my invention, I claim as new and desire to secure by Letters Patent-- 1. As an improvement in stop-watches, the combination of a toothed bevel-wheel on the arbor of the fourth wheel, a toothed bevelwheel on the arbor of the quarter-second hand, an intermediate bevel-pinion, a lifting-spring applied to the same, a forked spring pressing by one arm on the arbor of the bevel-pinion, and an actuating-lever that engages or releases the second arm of the forked spring,

so as to throw the bevel-pinion in or out of gear with the bevel-wheels, substantially as set forth.

2. As an improvement in stop-watches, the combination of a toothed bevel-wheel on the arbor of the fourth wheel, a toothed bevelwheel on the arbor of the quarter-second hand, a recoil-spring pressing on the bevel-wheel of the quarter-second hand, an intermediate bevel-pinion, a lifting-spring of greater strength than the recoil-spring, a forked spring bearing by one arm on the arbor of the bevel-pinion, and an actuating-lever that engages or releases the second arm of the spring, substantially as and for the purpose set forth.

In testimony that I claim the foregoing as my invention I have signed my name in pres ence of two subscribing witnesses.

HENRY A. LUGRIN.

Witnesses:

PAUL Gonrnn, SIDNEY hiLlNN. 

